I think we all wish the duration & quantity for this was more consistently defined. Understandable though, from the viewpoint of how hard it'd be to get test subjects for a definitively harmful few months.
You need to be eating gluten (at least the equivalent of 3-4 slices of bread) for several months before you test for antibodies if you expect a reliable result.
I had an appt a few yrs ago w/ the head of the GI dept at Stanford & he said a half slice of bread/day for a month. I'm sure I've seen others quoting their Dr that 2 wks was enough.
I don't think anybody really knows.
I also always found it puzzling that conventional wisdom is to eat gluten up til the day of tests/biopsy, yet when someone says they're 100% gluten-free for a week w/out feeling better it "takes time to heal". (I do realize that lab results & 'how we're feeling' isn't quite apples-to-apples but imho there's enough crossover to border on paradoxical)
Anyway, back on topic, w/out a very compelling reason for an official dx, I'd have a tough time making myself sick if I'm already certain I'm gluten-free for life afterwards regardless of results.
Good luck whichever way you go.